Answer:
i. The angle measure of Imogen's leftover should not be larger than

ii. The maximum number of slices that Imogen can fit is 2.
Explanation:
The leftover in Madeline's box forms angle = 203°
The leftover in Tyra's box forms angel =

Sum of angles formed = 203° +

=

Given that one box = 1 full circle of 360°. Then,
the angle formed by the leftover in Imogen's box = 360° -

=

Thus, the angle measure of Imogen's leftover slices should not be larger than
.
If each slice has an angle of
, the maximum number of slice that Imogen can fit =

= 2

= 2.45
The maximum number of slices that Imogen can fit is 2.